WO2003016014A1 - Procede et appareil de compression-injection de composite extrude - Google Patents

Procede et appareil de compression-injection de composite extrude Download PDF

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Publication number
WO2003016014A1
WO2003016014A1 PCT/US2002/025893 US0225893W WO03016014A1 WO 2003016014 A1 WO2003016014 A1 WO 2003016014A1 US 0225893 W US0225893 W US 0225893W WO 03016014 A1 WO03016014 A1 WO 03016014A1
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WO
WIPO (PCT)
Prior art keywords
polymer
layer
molding apparatus
mold cavity
molding process
Prior art date
Application number
PCT/US2002/025893
Other languages
English (en)
Inventor
Richard A. Weiland
Sing-Lit Jim
Roger Wang
Original Assignee
Ispa, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ispa, Inc. filed Critical Ispa, Inc.
Priority to JP2003520551A priority Critical patent/JP2004538177A/ja
Priority to EP02765994A priority patent/EP1417084A4/fr
Publication of WO2003016014A1 publication Critical patent/WO2003016014A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
    • B29C31/042—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds
    • B29C31/044—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds with moving heads for distributing liquid or viscous material into the moulds
    • B29C31/045—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds with moving heads for distributing liquid or viscous material into the moulds moving along predetermined circuits or distributing the material according to predetermined patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
    • B29C31/042—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds
    • B29C31/047—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds combined with moving moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
    • B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/04—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles using movable moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/04—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles using movable moulds
    • B29C2043/046—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles using movable moulds travelling between different stations, e.g. feeding, moulding, curing stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression means
    • B29C2043/3433—Feeding the material to the mould or the compression means using dispensing heads, e.g. extruders, placed over or apart from the moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression means
    • B29C2043/3433—Feeding the material to the mould or the compression means using dispensing heads, e.g. extruders, placed over or apart from the moulds
    • B29C2043/3438—Feeding the material to the mould or the compression means using dispensing heads, e.g. extruders, placed over or apart from the moulds moving during dispensing over the moulds, e.g. laying up
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
    • B29C31/08—Feeding of the material to be moulded, e.g. into a mould cavity of preforms to be moulded, e.g. tablets, fibre reinforced preforms, extruded ribbons, tubes or profiles; Manipulating means specially adapted for feeding preforms, e.g. supports conveyors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0053—Moulding articles characterised by the shape of the surface, e.g. ribs, high polish
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/20—Making multilayered or multicoloured articles
    • B29C43/203—Making multilayered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/20—Inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/256—Sheets, plates, blanks or films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products

Definitions

  • the present invention is directed to the field of extrusion compression injection technology, suitable for molding a large variety of articles of polymer materials.
  • the present invention has particular applicability for molding articles that require special materials and physical properties, including: high strength; multi-layers (including encased foamed core); mixed polymer materials (virgin, widespec, and recycled polymers); special in-lays, over-lays, inserts, and/or in-mold insert of objects to be on the inside or the outside of polymer article; special additives; and special finish outside layers.
  • polymer In traditional compression molding, polymer is poured into an open mold and compressed into form. The problem with this technology is that the polymer mass is still being pressed and spread throughout the mold, causing stress, line of weaknesses, and possible warpage that may compromise the article. Another problem with this and other regular injection technology is that the polyiuer is a single homogeneous material and does not have the ability to fashion individual layers for the unique functionalities.
  • Special functions can include UN protection, anti-static, color, high strength, barrier, fire retardancy, and foam for impact and/or insulation. Take the case of fire retardancy for example. Not only is the fire retardant additive very expensive, the resulting polymer with the additive also tends to have a very brittle physical property. For similar reasons, it is often not desirable to blend additives in throughout the complete part and such blending throughout the polymer sometimes creates problem with additional cost and deterioration of chemical and physical properties of polymer.
  • blow-molding co-extrusion is the relative limitation of the size of article that can be made and the type of materials that can be used and co-mingled because of the hang-strength and the frequent absence of relative bonding affinity of layers in relation to each other.
  • the nature of a polymer parison limits the co-extrusion to be in layer formation only, precluding the possibilities for forming structural elements or other special members, such as ribs, strips, clumps and other special formations of different polymers, as would be desirable for engineering, aesthetic, economic, ecological, and/or health and safety reasons, etc.
  • the molding process and apparatus of the present invention including extruding a polymer from at least one nozzle into a mold cavity, and displacing at least one of the nozzle and the mold cavity during the step of extruding to deposit at least a portion of a layer of polymer into the mold cavity, and subsequently enclosing the mold cavity with a mating mold section to produce a molded part.
  • FIG. 1 A is an overhead view of the polymer molding apparatus of the present invention.
  • Figs. IB, 1C, ID, IE, IF, 1G, 1H and II are detail views of various realizations of the nozzle mechanism in accordance with the present invention.
  • Fig. 2 is a side view showing the configuration and operation of the molding press in accordance with the present invention.
  • the present invention is directed to a compression injection process for the forming of both large and small objects having multiple layers, to obtain products, benefits and flexibilities not available with traditional processes. As shown in Figs.
  • the present molding apparatus employs a nozzle mechanism for laying down one or more types of polymer materials onto a bed having one or more open mold cavities.
  • the limitations for traditional processes include preventing the forming of products with the desired strength, size and varieties.
  • the inability of traditional compression processes to produce evenly-layered parts is eliminated by having multi-row extrusion mechanism lined up alongside each other that can move quickly relative to the mold table for an even and efficient filling of polymers of one or more different materials.
  • the present process also allows the ability to extrude different composite layers, including the extrusion of bonding materials, used to provide bonding between layers that are normally incompatible in the traditional molding process. These layers can now be laid down very efficiently and very effectively for specific purposes by way of the current process.
  • This current process is configured to produce a multi-layered product even though it is also well capable of producing a single-layered product. As illustrated in Figs.
  • the nozzle mechanism 12 includes one or more rows of nozzles 14. These nozzles can be stacked in various configurations, as shown in Figs. IE, IF and 1G, depending on the type of polymers that are extruded.
  • the nozzles 14 are configured to eject polymer into an open mold cavity 16, thereby providing a polymer ejection having substantially zero mold pressure over ambient air pressure.
  • the nozzles 14 are preferably spaced in a substantially adjoining manner, so that the polymer material from each nozzle effectively cascades as a sheet of material, preferably having uniform thickness into the mold cavity 16.
  • each individual row of nozzle(s) could consist of just one nozzle with long narrow opening 21, 23, as shown respectively in Figs. 1C and ID.
  • many nozzles can be employed having smaller openings 20, 22.
  • a plurality of mold cavities 16 are employed that can have the same or different sizes and cavity patterns, to accommodate various production requirements.
  • the mold cavities 16 are displaced relative to the nozzle mechanism 12 so as to deposit material from one end of a cavity to another with each pass.
  • the mold cavities 16 are mounted to a shuttle table 18 that shuttles back and forth with respect to a stationary nozzle mechanism 12, to deposit a layer of material during each shuttle pass.
  • the shuttle table 18 could alternatively be held stationary and the nozzle mechanism 12 could be displaced so as to deposit a material layer with each pass, all without departing from the invention.
  • the nozzle mechanism 12 includes a first row 20 of nozzles 14 and a second row 22 of nozzles 14. Material is ejected to the nozzles 14, preferably from a respective first extruder/accumulator assembly 24 and a second extruder/accumulator assembly 26. Each extruder/accumulator assembly 24, 26 is preferably configured to dispense a different type of polymer material, though both can dispense the same material if desired. In this way, the nozzle mechanism 12 can dispense multiple layers of polymer with each shuttle pass. It should be appreciated that the nozzle mechanism 12 could include any number of rows with any number of nozzles 14 in each row, in order to control the number of layers, ridges and types of polymers deposited with each shuttle pass.
  • each row would preferably be configured for receiving material from a respective extruder/accumulator assembly, that would preferably each dispense a different polymer material layer, such material layers being described in detail hereinbelow.
  • each nozzle 14 includes a separate actuator 28, e.g. a servo-motor, for independently turning the nozzle 14 on and off, to establish independent control.
  • actuators can varyingly control an internal valve in the respective nozzle 14, to vary the size of the effective valve opening or aperture, thereby varying the flow of polymer material through the nozzle 14.
  • a programmable extrusion control mechanism 37 is built in between each extruder/accumulator assembly and the corresponding row of extrusion nozzle(s).
  • the control mechanism 37 is preferably a valve, e.g. a pressure regulator valve. This mechanism serves several purposes.
  • the control mechanism 37 provides surge protection against pressure changes coming out of the extruder/accumulator assembly. It also works to control and regulate the rate and amount of flow of polymer material. It can also functions as a step down pressure control to better manipulate output, thereby providing an added programmable mechanism to the nozzle valves in fine tuning the amount, rate and thickness of extrusion, resulting in better quality output.
  • the same mechanism can also work as a complimentary shut-off valve to the nozzle mechanism, lowering the pressure during nozzle shut off and reducing the wear and tear on the nozzles. Moreover, quick servicing of the nozzle mechanism can easily be accomplished when the polymer conveying line gets turn off using the control mechanism.
  • the control mechanism 37 can be actuated either manually or electronically.
  • the layering can be precisely controlled using the nozzle mechanism 12 in a programmed fashion with the shuttle table 18.
  • the extrusion rate through the nozzles 14 can be coordinated with the speed of the shuttle table 18 to deposit layers of various thicknesses with each pass.
  • higher extrusion speed and/or larger valve opening would cooperate with slower table speed to produce a thicker layer, and visa versa to produce a thinner layer.
  • these rates can be varied during a single shuttle pass to produce graduations and localized variations in the thickness of the layers.
  • the rows 20, 21 can be selectively turned on and off so as to only permit precise filling of each cavity 16, and not allow material to spill onto the spaces between cavities, thereby reducing waste.
  • This selective activation can also be employed several times during a single shuttle pass, so as to extrude parallel rows of polymers instead of sheets.
  • individual nozzles 14 within a row can be alternately turned on while others are turned off, so as to extrude parallel rows perpendicular to those formed by selective activation of an entire row.
  • Such rows can be layed down alternately with each shuttle pass, or simultaneously using different respective rows. In this way, layers of polymer rows can be extruded into the cavities 16 that are sandwiched, intertwined or woven together to produce polymer products of any desired internal composition.
  • these steps could be used in a layer-deposition technique to form internal structural members such as reinforcing ribs, or a shear-resistant weave, or any other structure of any shape that could be formed of deposition layers.
  • the nozzles 14 can be selectively turned on and off so that polymer material is deposited in one mold cavity 16 but not another adjacent mold cavity during a particular shuttle pass.
  • a converging manifold 25 can optionally be mounted onto the plurality of rows of the nozzle mechanism, as illustrated in Figs. 1H, II.
  • the converging manifold 25 is preferably a longitudinally-extending member that runs the length of the nozzle mechanism and receives the nozzles 14 from at least a portion of the rows.
  • the nozzles 14 may each feed into their own respective converging bores.
  • the nozzles 14 from each row may feed into respective longitudinally- extending converging channels.
  • a valve piece 27 can optionally be equipped on the converging manifold 25 and can be programmed to actuate during the extrusion process to control and vary the overall thickness of the combined multi-layered extrusion or to totally shutoff the extrusion.
  • the shuttle table 18 has several degrees to movement, similar to standard CNC table, enabling the table 18 to move and turn relative to the nozzle mechanism 12.
  • the shuttle table 18 may be mounted on a set of rails to allow transverse motion to the shuttling direction.
  • the table may also optionally be mounted on a rotating turntable so as to create a circular pattern with the extruded layer. Any other type pattern could be created by varying the motion of the mold table 18, including sinusoidal or saw tooth patterns.
  • the present extruder/accumulator assemblies 24, 26 include a typical extruder 30 in which a hopper is filled with unprocessed polymer material and fed into the extruder body where it is melted. An extruder screw 32 is rotated to discharge the melted polymer. As a special feature of the invention, the extruder 30 is used to fill a pair of accumulators 34, 36. The extruder 30 runs continuously to fill a first accumulator 34. When full, the first accumulator 34 ejects the melted polymer toward the nozzle mechanism 12. While the first accumulator 34 ejects, the second accumulator 36 is being filled with polymer. In this way, the extruder 30 runs continuously and the polymer is thereby not overheated.
  • the accumulators 34, 36 can be ejected with a mechanical piston or a pneumatic or hydraulic-actuated ejection means, or other such device as would lend themselves to such an application.
  • a single extruder/accumulator assemblies are used for depositing each type of layer material.
  • a directional valve 38 is used at the junction of the respective accumulator lines to govern and regulate the flow of material, particularly in response to the requirements of the nozzle mechanism 12.
  • a respective number of hoppers will be set up with each hopper funneling one or more material into an extruder dedicated for each layer. In the case of a single layer product, all but one hopper/extruder would be turned off, or the same material will be fed through the multiple hoppers for a high speed layering.
  • Each hopper is equipped with ratio device meters to control the quantity of intake materials entering each of the hoppers.
  • the metering could be based on ratios in weight or volume, and the material or materials can be a combination of liquids, flakes, pellets, concentrates, powders, and pre-melted plastics.
  • the types and the numbers of extrusion stations are dependent upon the functionalities and the types of layers to be incorporated into the finished products.
  • the present molding table 18 can be fashioned to any size to meet the various demands of any variety of production processes.
  • the table can be 4' x 4' or smaller and can be larger than 15' x 15' to accommodate a large number of molds in a variety of sizes.
  • the shuttle table 18 moves into a molding press 40 having a bottom member 42 for receiving and supporting the table 18 and a top member 44 for holding the mating sections 46 of the mold sections into registration.
  • the molding press members 42, 44 are then brought together to mold the finished product. With the current process, polymer is extruded quickly, so that the polymer ejected mass will not have cooled too much before the closing of mold halves occur.
  • the degree of displacement of polymer to fill voids is greatly minimized, thereby creating little to no stress within the polymer article formed. Also, since the polymer is injected at substantially zero mold pressure over ambient air pressure, unlike previous methods, the material is not stressed in this manner, resulting in stronger molded products.
  • the molds are also designed in such a way that they can be heated up and cooled down to maintain a stable molding environment and to improve the surface texture and quality of polymer article.
  • the present mold tables 18 are part of a larger shuttle system whereby auxiliary mold tables can be moved in and out of the active production line as molds are being put in and removed, allowing the machine to be in constant production without the need to shut down for mold changes and so on, thus saving a lot of time and purging overheated materials if the machine has to be shut down constantly for mold changes etc.
  • the present process can also allow for one or more subsequent injection processes for creating additional surface layers on the exterior of the product.
  • a rough product fashioned of inexpensive material can be coated with an exotic or expensive material having a desirable color, tough-coat finish, or other desirable property.
  • a foamed polymer can be fashioned with such a coating to create a thermally-insulated bath tub or other product for maintaining a desired temperature of a liquid.
  • the mold is fashioned to slightly retract to open a void internal space
  • CLE 673555 1 around the molded article, e.g. about 1/16", for receiving on injection polymer coat.
  • the surrounding internal space could be established by suspending the article by pins, preferably retractably mounted within the mold cavity.
  • the ejector pins used for ejecting a finished article could also provide this function.
  • One or more injection molding ports 52 are used to inject polymer into the mold to create localized in-filling.
  • the pins 50 could subsequently be used to eject the finished part after cooling of the exterior layer.
  • the embossment mechanism can include a recessed portion of the mold mating section 46 having its own injector port 52. As the mold mating section 46 is first brought into contact with the deposited polymer, the recessed portion would remain a hollow void.
  • a separate embossment injection is made through the injector port 52 to fill the recessed portion.
  • the recessed portion has an edge so as to contain the separately-injected polymer and not allow "bleed-over" to the underlying layer.
  • the separate embossment injection can simultaneously produce an embossment feature having a different color or other physical property to the underlying layer.
  • the embossment mechanism can also include one or more separate "cookie cutter" sections of the mold mating section 46, each having its own injector port 52, to receive a different color and/or other type material.
  • This can be implemented as a separate reciprocating die section within the mold that can be selectively extended and retracted to provide a localized embossment at the surface of the article prior to a subsequent injection, or over the top of the article after a subsequent injection.
  • such an embossment can be used to apply a decorative rubber design as an anti-skid layer in an isolated region over the underlying layer. Any other specific injection can be applied to a localized spot. In this way, such applications can be performed concurrently with product manufacture to reduce manufacturing steps and process time, thus improving the economics of manufacture.
  • Color/Pigment Layer With our multi-layer approach, a thin outside color layer can be applied to the main body portion of the product, which could be formed of inexpensive recycled materials. This thin layer is all that is necessary to satisfy the color requirement without subjecting a manufacturer to the excessive high cost of pigment-bearing materials. Plus, the color/pigment could be added to any other layer or additive that could be on the exterior, resulting in further savings. A normal extruder would be used for the extrusion of this layer.
  • UN Layer The same multi-layer approach allows us to incorporate one or more outside UV layers to provide for effective protection of the polymer article against harmful ultraviolet radiation from the sun.
  • the added advantage of having outside UN layers instead of applying the UV additive to the whole polymer article is more than just the flexibility of using a higher concentration of UN additive on the outside for a better UN protection without any unnecessary degradation of physical properties, but also the flexibility of using a lower concentration on the layers immediately inside the outside layer, and also the realization of tremendous cost savings.
  • Anti-Skid Layer Any anti-skid layer could be formed around a structural body.
  • a linear low density polymer layer could be added as an anti-skid layer to the exterior of an underlying layer (typically high density) of the same material.
  • a soft, frictional anti-skid layer of low-density polyethylene could be applied over a rigid structural body of high-density polyethylene.
  • the layer is formed integrally with no additional labor and handling. Unlike previous-type anti-skid layers, this type of anti-skid layer need not peel off or separate from the underlying layers since it can be selected from the same polymer base but of different density, thus providing a perfect bonding.
  • the entire product is perfectly recyclable.
  • the desired frictional properties of the anti-skid layer using this approach could be easily adjusted for specific customer requirements by adjusting the density of the resin, since the frictional property of resin is a function to its molecular density.
  • the resulting antiskid layer is smooth and easily washable, thereby conforming with FDA and USDA requirements for pallet applications.
  • the anti-skid layer can also be color matched to serve as a color layer. A normal extruder would be used for extrusion on this layer.
  • Fire Retardant Layer By applying a fire-retardant layer, the overall cost is greatly reduced by providing this a protective layer that serves the same fire-retardant function without using the expensive additive throughout the entire product. The layering also eliminates the heavy weight issue. To minimize the brittleness issues - breaking, cracking and structural problems — a special strength layer is formed within the fire-retardant layer to provide the necessary additional support needed, or by encapsulating it between layers. Since the quantity of fire-retardant additives used is very small when using only a thin layer, the recyclability of the product remains acceptable. A normal extruder will be used for extrusion on this layer. Strength Layer: In creating a specific strength layer, two separate aspects of technology are applied.
  • the multi-layer process itself provides additional mechanical strength as a well-known inherent property of multiple layers.
  • a specific strength layer can be fashioned to make the polymer super strong and yet recyclable.
  • long strand fiberglass, nylon strands and/or other natural fibers such as hemp are blended into the polymer.
  • the material for this layer could be nylon, polyethylene, or polypropylene.
  • the extruder could cooperate with a downstream feeder that would bypass the shearing of the screw inside the extruder.
  • Another option to introduce a strength layer is to use nylon alone as the engineered polymer for this layer due to its inherent high strength properties. The benefits for making this strength layer possible are numerous.
  • the strength layer allows for the compensation of the lower structural strength of the other layers, thereby allowing utilization of exotic and unique features and materials to achieve functional utilities such as anti-skid, fire- retardant etc.
  • a foam layer can be provided for impact resistance, insulation, weight reduction and volume fill.
  • the present multi-layer process provides a desired level of rigidity and impact resistance by varying the materials and thickness of the foam and non-foam layers.
  • An exterior foam layer can also serve as a color layer, anti-skid and strength layer.
  • most of the interior layers have the flexibility of utilizing either virgin or recycled materials.
  • Providing foaming layers also serves an additive function. Improvement in the insulation factor and weight reduction can be achieved throughout a combination of varying the degree of foaming and the thickness of the foam layer. In certain specific applications, foaming is effective for the volume filling of cavities.
  • a foam layer or layers can also add mechanical strength, providing a favorable mass to strength ratio. There are two typical ways to introduce foam to the plastics.
  • Barrier Layer Special impervious material can be applied to the exterior to prevent seeping or movement of content material such as water or solvent through the
  • This barrier material can also be combined with a color or other layer.
  • a typical extruder will be used for this purpose.
  • By being able to use a low level of barrier material to ensure a proper barrier the amount of material cost is greatly reduced, especially for a large plastic product.
  • such materials could have problems with being too expensive and too heavy or rigid if used throughout the whole part. This would not be a problem with the present method, since only a layer of barrier material would be required instead or using such a material throughout the whole part.
  • a bond layer could be provided to bond together layers that may otherwise be incompatible and may not bond together well, such as polyethylene and nylon layers. In the case of compatible materials being used between layers that bond well naturally, there will be no need for this bond layer.
  • Recycled Layer In order to reduce material costs, a layer of recycled material can be layed down. This layer can be reinforced with other more expensive layers to provide strength, color or any other properties, to provide an inexpensive product having the desirable attributes. The entire product can be formed of recyclable materials, so as to provide a recyclable product.
  • the present layering process allows for the addition of inserts and additives.
  • long-fiber fiberglass strands can be added to the molded article by laying them down in between layers.
  • Other materials could be added such as hemp fibers, rubber pieces particulate matter and even liquids.
  • such additives could be added while avoiding the high heat and shear conditions of the extruder that degrade the materials and break the long fiber strands.
  • a dispenser device 60 suspended above the table 18.
  • the dispenser device 60 can include a shaker for shaking down fibers or particles into the mold cavity 16.
  • the shaker 60 can be oriented to lay fibers in at a desired angle to the mold cavity 16.
  • the shaker 60 can also be made to rotate so as to lay in fibers in a criss-cross direction. Also, multiple shakers could be employed to lay in strands in any desired orientations. This method allows additives to be placed at very specific regions or layers of the molded product.
  • the dispenser device 60 can include a mechanism for incorporating special in-lays, over-lays and inserts to the interior or exterior of the polymer article during molding.
  • Many types of elements can be incorporated by in-mold introduction, such as screws, handles and hinges.
  • the invention allows two molded parts to be formed separately, and a hinge or other component could be placed between the adjoining molds. In this way, a finished part could be formed in situ, eliminating the time and labor of the finishing step and thereby reducing production costs.
  • a thermo label for high-quality graphics to the exterior surface of the polymer, and optionally inject a clear protective layer therearound.
  • an RFID chip/tag to the inside of the polymer article, or a label affixed to the outside having an RFID (i.e. Radio Frequency Identification).
  • this process can be used to incorporate structural members.
  • reinforcing members such as rebar can be formed within a polymer product to provide considerable mechanical strength.
  • a steel I-beam can be encased in polymer with the present invention. This has special applicability for steel structural members used in a corrosive environment, e.g. for piers used at the ocean, where a polymer-encased member would resist salt corrosion.
  • any other types of inserts could be contemplated.
  • a prefabricated fiberglass mesh could be inserted, having a predetermined shape, and molding could be performed therearound.
  • an armor member e.g. formed of "Kevlar”
  • Kevlar could be embedded to the interior or exterior of a polymer member.
  • armored components can be formed of polymer, being extremely lightweight compared with previous-type steel armor plating.
  • the present insert molding technique can potentially create a large variety of high-strength, lightweight components, that can be used for fabricating vehicle components, airframes, architectural members and other such applications.
  • the dispenser device 60 can include a jig for supporting the insert, either manually or robotically placed at a desired position in the mold.
  • the dispenser device 60 can include a rollout mechanism, equipped to roll out sheet material of any desired length across the shuttle table 18.
  • This roll-out mechanism could also include a cutter to automatically cut the sheet material to any desired length. In this way, such sheet material could be added to one or more mold cavities 16, to further provide for the insertion of objects to provide strength or any other desired physical property.
  • the roll-out mechanism could be oriented to pivot to provide sheet material having any desired orientation.
  • the roll-out mechanism could include more than one roll-out stations, for dispensing sheet material at any desired orientation, either simultaneously or sequentially, to suit the requirements of a desired process.
  • the present method enables a shape to be generally deposited around the insert.
  • the mating mold section 46 would also be used for finishing detail, with a minimum of polymer dislocation and flash thereby minimizing material stress.
  • the fluid displacement of the molten polymer resulting from the weight of the insert can be calculated and controlled, allowing for tight tolerances to be maintained.
  • the present method and apparatus is sufficiently versatile to allow perform traditional injection molding operations, traditional compression molding operations, or a combination of injection and compression processes.
  • the injection mechanism could be fashioned from a multi-nozzle hot runner system to a single nozzle system on one or both sides of the presses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Robotics (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé et un appareil de moulage consistant à extruder un polymère à partir d'au moins un ajutage (12) dans une cavité de moulage (16), à déplacer l'ajutage (12) et la cavité de moulage (16) lors de l'étape d'extrusion pour déposer au moins une partie d'une couche de polymère dans la cavité de moulage (16), et enfin à refermer la cavité de moulage (16) à l'aide d'une partie d'accouplement (40) pour produire une partie moulée.
PCT/US2002/025893 2001-08-16 2002-08-15 Procede et appareil de compression-injection de composite extrude WO2003016014A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2003520551A JP2004538177A (ja) 2001-08-16 2002-08-15 押出し複合圧縮射出方法及び装置
EP02765994A EP1417084A4 (fr) 2001-08-16 2002-08-15 Procede et appareil de compression-injection de composite extrude

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US31272301P 2001-08-16 2001-08-16
US60/312,723 2001-08-16

Publications (1)

Publication Number Publication Date
WO2003016014A1 true WO2003016014A1 (fr) 2003-02-27

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PCT/US2002/025893 WO2003016014A1 (fr) 2001-08-16 2002-08-15 Procede et appareil de compression-injection de composite extrude

Country Status (5)

Country Link
US (1) US20030127765A1 (fr)
EP (1) EP1417084A4 (fr)
JP (1) JP2004538177A (fr)
CN (1) CN1564733A (fr)
WO (1) WO2003016014A1 (fr)

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WO2018234712A1 (fr) * 2017-06-22 2018-12-27 Compagnie Generale Des Etablissements Michelin Installation et procede de coextrusion
WO2022005642A1 (fr) * 2020-06-30 2022-01-06 HiTek Fabrication Système et procédé de mousse polymère

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FR2979631B1 (fr) * 2011-09-05 2013-10-04 Schneider Electric Ind Sas Pieces en plastique comprenant un revetement ignifuge et leur procede de preparation.
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TW201532782A (zh) 2013-08-30 2015-09-01 Berry Plastics Corp 容器以及其製造方法
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WO2006019160A1 (fr) * 2004-08-19 2006-02-23 The Japan Steel Works, Ltd. Processus pour produire un objet moulé et appareil correspondant
US8119054B2 (en) 2004-08-19 2012-02-21 Japan Steel Works, Ltd. Method and apparatus for manufacturing a molded product
WO2018234712A1 (fr) * 2017-06-22 2018-12-27 Compagnie Generale Des Etablissements Michelin Installation et procede de coextrusion
FR3067967A1 (fr) * 2017-06-22 2018-12-28 Compagnie Generale Des Etablissements Michelin Installation et procede de coextrusion
WO2022005642A1 (fr) * 2020-06-30 2022-01-06 HiTek Fabrication Système et procédé de mousse polymère

Also Published As

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CN1564733A (zh) 2005-01-12
EP1417084A4 (fr) 2005-05-04
US20030127765A1 (en) 2003-07-10
EP1417084A1 (fr) 2004-05-12
JP2004538177A (ja) 2004-12-24

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